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Mirrors > Home > ILE Home > Th. List > imval | GIF version |
Description: The value of the imaginary part of a complex number. (Contributed by NM, 9-May-1999.) (Revised by Mario Carneiro, 6-Nov-2013.) |
Ref | Expression |
---|---|
imval | ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) = (ℜ‘(𝐴 / i))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 ∈ ℂ) | |
2 | ax-icn 7715 | . . . . . 6 ⊢ i ∈ ℂ | |
3 | 2 | a1i 9 | . . . . 5 ⊢ (𝐴 ∈ ℂ → i ∈ ℂ) |
4 | iap0 8943 | . . . . . 6 ⊢ i # 0 | |
5 | 4 | a1i 9 | . . . . 5 ⊢ (𝐴 ∈ ℂ → i # 0) |
6 | 1, 3, 5 | divclapd 8550 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 / i) ∈ ℂ) |
7 | reval 10621 | . . . 4 ⊢ ((𝐴 / i) ∈ ℂ → (ℜ‘(𝐴 / i)) = (((𝐴 / i) + (∗‘(𝐴 / i))) / 2)) | |
8 | 6, 7 | syl 14 | . . 3 ⊢ (𝐴 ∈ ℂ → (ℜ‘(𝐴 / i)) = (((𝐴 / i) + (∗‘(𝐴 / i))) / 2)) |
9 | cjcl 10620 | . . . . . 6 ⊢ ((𝐴 / i) ∈ ℂ → (∗‘(𝐴 / i)) ∈ ℂ) | |
10 | 6, 9 | syl 14 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (∗‘(𝐴 / i)) ∈ ℂ) |
11 | 6, 10 | addcld 7785 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((𝐴 / i) + (∗‘(𝐴 / i))) ∈ ℂ) |
12 | 11 | halfcld 8964 | . . 3 ⊢ (𝐴 ∈ ℂ → (((𝐴 / i) + (∗‘(𝐴 / i))) / 2) ∈ ℂ) |
13 | 8, 12 | eqeltrd 2216 | . 2 ⊢ (𝐴 ∈ ℂ → (ℜ‘(𝐴 / i)) ∈ ℂ) |
14 | oveq1 5781 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 / i) = (𝐴 / i)) | |
15 | 14 | fveq2d 5425 | . . 3 ⊢ (𝑥 = 𝐴 → (ℜ‘(𝑥 / i)) = (ℜ‘(𝐴 / i))) |
16 | df-im 10616 | . . 3 ⊢ ℑ = (𝑥 ∈ ℂ ↦ (ℜ‘(𝑥 / i))) | |
17 | 15, 16 | fvmptg 5497 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘(𝐴 / i)) ∈ ℂ) → (ℑ‘𝐴) = (ℜ‘(𝐴 / i))) |
18 | 13, 17 | mpdan 417 | 1 ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) = (ℜ‘(𝐴 / i))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1331 ∈ wcel 1480 class class class wbr 3929 ‘cfv 5123 (class class class)co 5774 ℂcc 7618 0cc0 7620 ici 7622 + caddc 7623 # cap 8343 / cdiv 8432 2c2 8771 ∗ccj 10611 ℜcre 10612 ℑcim 10613 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-cnex 7711 ax-resscn 7712 ax-1cn 7713 ax-1re 7714 ax-icn 7715 ax-addcl 7716 ax-addrcl 7717 ax-mulcl 7718 ax-mulrcl 7719 ax-addcom 7720 ax-mulcom 7721 ax-addass 7722 ax-mulass 7723 ax-distr 7724 ax-i2m1 7725 ax-0lt1 7726 ax-1rid 7727 ax-0id 7728 ax-rnegex 7729 ax-precex 7730 ax-cnre 7731 ax-pre-ltirr 7732 ax-pre-ltwlin 7733 ax-pre-lttrn 7734 ax-pre-apti 7735 ax-pre-ltadd 7736 ax-pre-mulgt0 7737 ax-pre-mulext 7738 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-nel 2404 df-ral 2421 df-rex 2422 df-reu 2423 df-rmo 2424 df-rab 2425 df-v 2688 df-sbc 2910 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-br 3930 df-opab 3990 df-mpt 3991 df-id 4215 df-po 4218 df-iso 4219 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-fv 5131 df-riota 5730 df-ov 5777 df-oprab 5778 df-mpo 5779 df-pnf 7802 df-mnf 7803 df-xr 7804 df-ltxr 7805 df-le 7806 df-sub 7935 df-neg 7936 df-reap 8337 df-ap 8344 df-div 8433 df-2 8779 df-cj 10614 df-re 10615 df-im 10616 |
This theorem is referenced by: imre 10623 reim 10624 imf 10628 crim 10630 |
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